Table 1: Log of the four BeppoSAX NFI observations presented in this work.

Source	Obs.	Start time (UT)	End time (UT)	LECS	MECS	HPGSPC	PDS	2-10 keV MECS
				ksec	ksec	ksec	ksec	count rate (s-1)
X1543-624	1	1997 Feb 21 09:38:02	1997 Feb 21 17:39:50	6.6	16.6	7.5	7.5	12.8
	2	1997 Apr   1 22:38:29	1997 Apr   2 05:54:05	6.6	18.3	7.8	8.1	11.4
X1556-605	1	1997 Mar 10 17:10:02	1997 Mar 10 23:58:50	7.3	17.9	7.9	7.9	5.42
	2	1997 Apr   3 18:08:47	1997 Apr   4 01:54:50	5.1	17.8	7.3	7.7	5.69